What a Flexible Spending Account Is

A Flexible Spending Account (FSA) is a workplace benefit that lets you set aside pre-tax money to pay for medical costs that your insurance doesn't cover. You decide how much to contribute each year, your employer deducts it from your paycheck before taxes are calculated, and you use a debit card or submit receipts to withdraw the money when you need it.

The key difference from an HSA: FSAs are "use it or lose it." Money you don't spend by the end of the plan year doesn't roll over to the next year—with a narrow exception called a carryover or grace period that your employer may or may not offer. This makes FSAs useful if you know roughly what you'll spend on medical costs, but risky if you're uncertain.

FSAs are offered only through employers. You can't open one on your own, and you can only enroll during your company's open enrollment period or within 30 to 60 days of a may have access to life event like a birth, marriage, or loss of other coverage.

Key Takeaways

  • FSA contributions come from your paycheck before taxes, which lowers your taxable income and the amount you owe at tax time.
  • You can spend FSA money on copays, deductibles, prescriptions, dental work, vision care, and other medical expenses your insurance doesn't fully cover.
  • Money left unspent at the end of the plan year is forfeited unless your employer offers a carryover (up to $640 in 2024) or a grace period (usually 2.5 months).
  • You must enroll during open enrollment or within 30 to 60 days of a life event; you cannot change your election mid-year except for specific may have access to reasons.
  • FSAs work alongside any health insurance plan, including high-deductible plans, and can reduce your out-of-pocket costs significantly if you estimate your spending accurately.

How Much You Can Contribute and What It Saves

For 2024, the IRS limit is $3,200 per year. Your employer may set a lower limit, but not higher. You decide the amount during open enrollment, and that money is divided across your paychecks for the rest of the plan year.

The tax savings depend on your income and tax bracket. If you contribute $2,400 to an FSA and you're in the 22% federal tax bracket, you save roughly $528 in federal taxes alone—plus state and local taxes in most states, and 7.65% in payroll taxes. That's real money back in your pocket, even before you use the account.

The tradeoff is that you're betting on your medical spending. If you contribute $2,400 and only spend $1,500, you lose the remaining $900 (unless your employer allows a carryover or grace period). This is why FSAs work best when you have predictable costs: regular prescriptions, ongoing therapy, dental work you've already scheduled, or contact lenses you buy every year.

What You Can and Cannot Buy With FSA Money

FSA funds cover a broad range of medical expenses, but the IRS has specific rules. You can use the money for copays, coinsurance, deductibles, prescription medications, insulin, inhalers, and other drugs your doctor prescribes. You can also pay for dental work (fillings, root canals, orthodontics), vision care (glasses, contacts, exams), hearing aids, and mental health treatment.

Some expenses surprise people. You can buy over-the-counter pain relievers, allergy medicine, and cold medicine—but only if you have a prescription from your doctor. You can pay for gym memberships if your doctor prescribes exercise as treatment for a specific condition, and you can cover the cost of a weight-loss program if a doctor refers you. You can pay for acupuncture, chiropractic care, and physical therapy if a licensed provider delivers it.

You cannot use FSA money for cosmetic procedures, vitamins (unless prescribed by a doctor for a diagnosed deficiency), or health insurance premiums. You also cannot buy over-the-counter items like sunscreen, toothpaste, or shampoo, even if they have medicinal claims on the label.

How to Access Your Money

Your employer provides an FSA debit card that you can use at pharmacies, doctors' offices, and other medical providers. When you swipe the card, the amount is deducted from your FSA balance. Some providers—especially smaller practices—may not accept the card, in which case you pay out of pocket and then submit a receipt to your FSA administrator for reimbursement.

Reimbursement usually takes 5 to 10 business days. You'll need to submit the receipt plus a claim form (often available through your FSA provider's website or app). Keep receipts for at least three years in case of an audit.

You can check your balance anytime through your FSA provider's website or mobile app. Many employers also send quarterly statements. If you're running low on funds near the end of the year, you can plan your remaining medical spending—scheduling a dental cleaning or ordering contact lenses—to use up the balance before the important date.

The "Use It or Lose It" Rule and Your Options

On the last day of your plan year, any money you haven't spent is forfeited. This is the biggest risk of an FSA. If you contribute $3,000 and only spend $2,100, you lose $900.

However, your employer may offer one or both of these options. A carryover allows you to roll up to $640 (in 2024) into the next plan year. A grace period gives you an extra 2.5 months after the plan year ends to spend the remaining balance. Some employers offer both, some offer one, and some offer neither. Check your plan documents or ask your benefits administrator which applies to you.

If your employer offers neither, you need to estimate conservatively. It's better to contribute less and miss out on some tax savings than to contribute too much and forfeit money. You can always increase your contribution next year if you underestimated.

FSA vs. HSA: When to Choose Each

If your employer offers both an FSA and an HSA, the choice depends on your situation. An HSA is better if you want to save money long-term: contributions roll over indefinitely, you can invest the balance, and you can withdraw it tax-free for any reason after age 65. But you can only open an HSA if you're enrolled in a high-deductible health plan (HDHP).

An FSA is better if you're not on an HDHP, or if you have predictable medical costs you know you'll spend each year. FSAs also let you contribute more money per year than an HSA if your employer allows it (though the IRS limit is $3,200). If you're on an HDHP, you can use both an HSA and an FSA together, though this requires careful planning to avoid overfunding.

If you're unsure which to choose, calculate your expected medical spending for the next year—prescriptions, copays, dental work, vision care—and see which account structure fits better. If you can't predict your spending, an HSA is safer because the money doesn't disappear.

Changing Your FSA Election Mid-Year

Once you enroll in an FSA, you're locked in for the plan year. You cannot change your contribution amount or cancel the account unless you have a may have access to life event. These include marriage, divorce, birth or adoption of a child, loss of other health coverage, a significant change in your spouse's benefits, or a change in your childcare costs.

If you experience a may have access to event, you usually have 30 to 60 days to notify your benefits administrator and make changes. Some employers are stricter; check your plan documents. If you don't have a may have access to event and you realize mid-year that you over- or under-estimated your spending, you're stuck until the next open enrollment period.

Frequently Asked Questions

What happens to my FSA money if I leave my job?

You lose access to the account. Any unspent balance is forfeited, even if you're leaving mid-year. Some employers allow you to submit claims for expenses you incurred before you left, but only if you do so within a set important date (often 30 to 90 days). Check with your benefits administrator before you leave.

Can I use my FSA for my spouse or children?

Yes. FSA money can pay for medical expenses for you, your spouse, and any dependent children under age 26. You don't need to be on the same health insurance plan. Just make sure the expense is for a covered service and you have a receipt.

Do I need receipts to use my FSA debit card?

Not always. At pharmacies and some medical offices, the system knows the purchase is medical and the card works without a receipt. At other places—like a general store buying over-the-counter medicine—you may be asked to provide a receipt to prove the item is FSA-may be able to access. Keep receipts for everything just in case.

Can I roll over unused FSA money to next year?

Only if your employer's plan allows it. Some plans offer a carryover (up to $640 in 2024), some offer a grace period (usually 2.5 months to spend the money after the year ends), and some offer neither. Check your plan documents or ask your benefits administrator which applies to you.

Is an FSA worth it if I'm not sure how much I'll spend?

It depends on how uncertain you are. Even a conservative estimate—say, $1,200 in annual medical costs—saves you $180 to $300 in taxes. But if you truly can't predict your spending and your employer doesn't offer a carryover or grace period, an HSA (if you're may be able to access) is safer because unused money stays in the account.